TW201537033A - Single axis eccentric screw pump - Google Patents

Abstract

The present invention comprises a casing 1, a stator 2 which one end is connected to the casing and an inner periphery is formed as a female screw, a rotor 3 formed as a male screw shaft, and an end stud 4 connected to the other end of the stator 2. The stator 2 has a stator body 10 and an external cylinder 9 detachably positioned around the stator body 10. The connecting part of the stator body 10 and the casing 1, and the connecting part of the stator body 10 and the end stud 4 have a closed construction for at least preventing a foreign matter from entering therein.

Description

Single-axis eccentric screw pump

The present invention relates to a single-axis eccentric screw pump.

It is known that a uniaxial eccentric screw pump is composed of an outer cylinder and a stator body, and the stator is held between the outer casing and the end stud by a support bolt (for example, refer to Patent Document 1).

In the above-described uniaxial eccentric screw pump, a fluid having a high temperature in which water vapor, hot water, or the like is supplied to the stator body and a high-temperature washing operation for sterilizing the inner surface while cleaning is provided. At this time, the stator body is expanded, but the deformation toward the outer diameter side is prevented by the outer cylinder, so the displacement amount toward the inner diameter side is the interference amount (the outer surface of the rotor and the inner surface of the stator overlap). Will get bigger. In this state, if the rotor is rotated, the frictional force of the rotor of the stator body is excessively large, so that the stator body is abnormally worn or the rotor is damaged. And the rotor may also become unable to rotate.

On the other hand, in order to avoid such a situation, it is also considered that the rotor can be rotated on the inner surface of the stator during the high-temperature cleaning operation. A larger interval is formed between the outer surfaces of the rotors, but in this case, the discharge pressure during normal operation becomes small and the desired discharge amount cannot be obtained.

[Practical Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-256748

An object of the present invention is to provide a uniaxial eccentric screw pump which can transfer a fluid from a desired discharge pressure during normal operation, and which does not cause abnormal wear on the stator, can be washed and sterilized at a high temperature, and is not exposed. In the surrounding atmosphere, bacteria and the like are invaded, and the environment after washing can be maintained.

According to the present invention, there is provided a uniaxial eccentric screw pump comprising: a casing; and a stator having an end portion connected to the casing and having an inner circumferential surface forming a female screw type; and inserting the stator a rotor composed of a male screw type shaft body and an end stud pile connected to the other end portion of the stator, wherein the stator is provided by a stator body and detachably disposed at an outer peripheral portion thereof. The outer cylinder is configured to include at least a connection portion between the stator body and the outer casing and a connecting portion between the stator body and the end stud pile, at least to prevent foreign matter from the outside. Intrusive locking structure.

According to this configuration, when the body of the stator is sterilized by the heating fluid, the outer cylinder can be removed from the stator body. Thereby, even if the high-temperature fluid flows, the stator can expand in the outer diameter direction, and the pressure contact to the rotor caused by the expansion toward the inner diameter side is suppressed. Therefore, even when the temperature is washed, the contact pressure with the stator does not increase, and the interference is excessively increased. In addition, after the operation of attaching and detaching the outer cylinder and the removal of the outer cylinder, since the bacteria are prevented from intruding from the outside by the lock structure, the environment after the washing can be maintained. Switching between operation and normal operation.

The above-described latching structure is preferable in that a sealing structure that leaks from the both end portions of the stator toward the outside can be prevented.

According to this configuration, the airtightness can be maintained in any of the normal operation and the cleaning operation, and the transferred fluid is a medicine or the like without fear of leakage to the surroundings.

The stator body is made of rubber or a resin material, and the outer cylinder is preferably made of a metal material.

According to this configuration, the deformation of the stator body is suppressed by the outer cylinder made of a metal material during the normal operation, and the appropriate interference can be maintained. Therefore, the discharge is performed when the fluid is transferred by the rotation of the rotor. The pressure can be the expected value.

The lockable structure includes a crotch portion formed at a connecting portion between the end stud and the stator, and a first cooker held in a state in which the two crotch portions are in contact with each other, and the outer casing and the outer casing stator It is preferable that the crotch portion of the connecting portion and the second crotch that hold the two crotch portions in contact with each other are preferable.

With this configuration, it is possible to simply obtain the locked state by merely abutting the end faces of the crotch portions to attach the cookware. The stator body can be simply exchanged by simply unpacking the cookware.

An adapter ring made of a metal material is attached to both ends of the stator, and each of the adapter rings is preferably configured separately.

By this configuration, the stator having a complicated internal structure can be simply formed into a crotch portion. If the stator has to be exchanged due to wear, the adapter ring can be removed and reused.

It is preferable that a support bolt that connects the outer casing and the end screw pile and a spacer that is externally attached to the outer casing and the end screw pile to be held at a predetermined interval are preferably provided.

According to this configuration, even in a state where the outer cylinder is removed, the interval between the outer casing and the end stud can be maintained at a constant value by the spacer, so that the stator body can be held in the desired compressed state.

The outer cylinder is composed of a plurality of covers that are divided in the circumferential direction, and is preferably provided with an adjustment means for adjusting the interval between the covers.

According to this configuration, it is not necessary to disassemble the cover from the stator body, and the expansion is widened by the adjusting means, so that expansion in the outer diameter direction of the stator body can be allowed.

The detection means for detecting the degree of expansion toward the outer diameter side of the stator body, and the detection value based on the detection value in the detection means The means for controlling the drive control is preferably a control means for automatically adjusting the interval of the cover.

According to this configuration, since the interval between the covers can be automatically adjusted in accordance with the degree of expansion in the outer diameter direction of the stator body, the operator does not need to perform the work of determining the normal operation or the cleaning and sterilization.

According to the present invention, when the body of the stator is cleaned by the heating fluid, since the outer cylinder can be removed from the stator body, the stator body can be deformed toward the outer diameter side even if it is thermally expanded, and the rotation of the rotor is not impaired. Therefore, in either of the normal operation and the cleaning and sterilization, the rotor does not press the stator body to cause abnormal wear. Further, since the lock structure is provided, it is not necessary to disassemble the stator body, and it is possible to switch from the washing operation to the normal operation in a state where the environment after washing is continued.

1‧‧‧Shell

2‧‧‧stator

3‧‧‧Rotor

4‧‧‧End studs

5‧‧‧Connector rod

6‧‧‧Connector

7‧‧‧Connecting tube

8‧‧‧锷

9‧‧‧Outer tube

10‧‧‧stator body

11a, 11b‧‧‧ ring

12a, 12b‧‧‧ adapter ring

13a, 13b‧‧‧ tubular

14a, 14b‧‧‧锷

15‧‧‧1st cookware

15a‧‧‧ Support shaft

15b, 15c‧‧‧挟具部

15d‧‧‧Clip Department

16‧‧‧2nd cookware

17‧‧‧Transfer space

18‧‧‧锷

19‧‧‧Support bolts

20‧‧‧Support film

21‧‧‧ spacer

22‧‧‧ Nuts

23‧‧‧1st support frame

24a, 24b‧‧‧ side section

24c‧‧‧ upper face

24‧‧‧2nd support frame

25‧‧‧ convex

26‧‧‧screws

27‧‧‧Upper cover

27a‧‧‧Semi-cylindrical

27b‧‧‧Extension

28‧‧‧Under the cover

28a‧‧‧Semi-cylindrical

28b‧‧‧Extension

29‧‧‧ Maintaining components

30‧‧‧Upper board

31‧‧‧ Lower pallet

32‧‧‧Links

33‧‧‧Installation pallet

34‧‧‧Support table

35‧‧‧ Pressing Department

36‧‧‧Hydraulic cylinder

37‧‧‧Guide members

38a‧‧‧Bolts

38b‧‧‧ nuts

39‧‧‧ Ring

[Fig. 1] (a) is a schematic plan view of a uniaxial eccentric screw pump of the present embodiment, and (b) is a cross-sectional view taken along line A-A.

[Fig. 2] A schematic front view of the uniaxial eccentric screw pump shown in Fig. 1.

[Fig. 3] An enlarged cross-sectional view showing a state in which the outer casing and the stator of Fig. 1(b) are disassembled.

[Fig. 4] shows the state in which the outer casing and the stator are connected from Fig. 3 Zoom in on the profile.

[Fig. 5] An enlarged cross-sectional view showing a state in which it is screwed by a support bolt from Fig. 4.

[Fig. 6] A partially enlarged view showing a state in which the stator and the end stud of Fig. 1(b) are disassembled.

[Fig. 7] An enlarged cross-sectional view showing a state in which the stator and the end studs are connected from Fig. 6.

[Fig. 8] An enlarged cross-sectional view showing a state in which the support bolt is screwed from Fig. 7.

[Fig. 9] A schematic front view showing the cooker of Fig. 1.

[Fig. 10] (a) is a side view showing one end portion of a stator body of another embodiment, and (b) is a front cross-sectional view showing a part thereof.

[Fig. 11] (a) is a schematic front view of a uniaxial eccentric screw pump of another embodiment, (b) is a side view showing the first support frame, and (c) is a side view showing the second support frame.

[12] Fig. 12 is a schematic front view of a uniaxial eccentric screw pump of another embodiment.

[Fig. 13] A schematic explanatory view showing a support structure of an outer cylinder of another embodiment.

[Fig. 14] A schematic explanatory view showing a support structure of an outer cylinder of another embodiment.

Fig. 15 is a schematic explanatory view showing an outer cylinder of another embodiment.

Hereinafter, embodiments of the present invention will be described in accordance with an additional drawing. Further, in the following description, the term indicating the specific direction and position (for example, the terms "upper", "lower", "side", and "end") is used as needed, but the use of those terms is for The invention is easily understood by referring to the drawings, and the scope of the technology of the present invention is not limited by the meaning of those terms. Further, the following description is merely illustrative in nature and is not intended to limit the application of the invention, or the application. Further, the drawings are merely intended to indicate that the ratios of the dimensions and the like are different from reality.

Fig. 1 is a view showing a uniaxial eccentric screw pump of this embodiment. This uniaxial eccentric screw pump includes a driver (not shown) provided on one end side of the casing 1, and a stator 2, a rotor 3, and an end stud 4 provided on the other end side.

The outer casing 1 is formed by forming a metal material into a tubular shape, and accommodates the coupler rod 5. One end of the coupler lever 5 is coupled to the coupler 6 such that power from the drive is communicated. A connecting pipe 7 is connected to the outer peripheral surface of the one end side of the outer casing 1, so that a fluid (for example, a highly viscous food such as margarine or miso, etc.) can be supplied from a tub or the like (not shown). Further, a crotch portion 8 extending toward the outer diameter side is formed in the other end opening portion of the outer casing 1.

The stator 2 is composed of an outer cylinder 9 and a stator body 10 that is disposed in a state of being in close contact with the inner surface thereof.

The outer cylinder 9 is composed of an upper cover 27 and a lower cover 28 made of a metal material (for example, stainless steel or the like) as shown in Fig. 2 . The two covers 27 and 28 are composed of semi-cylindrical portions 27a and 28a and extending portions 27b and 28b extending outward from both side edges. The outer cylinder 9 is the upper cover 27 The semi-cylindrical portions 27a and 28a of the lower cover 28 are disposed on the outer circumference of the stator 2, respectively, and the through-holes formed in the extending portions 27b and 28b are supported by the bolts 38a and the snails in a state in which the extending portions face each other. The cap 38b is tightened. Thereby, the extending portions abut each other, and the semi-cylindrical portions 27a and 28a are in close contact with the outer peripheral surface of the stator 2. In this state, in the normal operation of rotating the rotor 3 to transfer the fluid, the deformation of the stator body 10 is suppressed by the outer cylinder 9 made of a metal material, and the appropriate interference can be maintained. Therefore, the discharge pressure at the time of transferring the fluid can be a desired value.

Here, the connection of the outer casing 1 and the stator 2 and the connection of the stator 2 and the end studs 4 will be described in detail with reference to FIGS. 3 to 8 .

In the state in which the adapter rings 12a and 12b are respectively attached to the both ends of the stator main body 10 in the outer peripheral part, as shown in FIGS. 3 and 6, the ring portions 11a and 11b are provided. The leading end portion is beyond the flange portions 14a, 14b of the adapter rings 12a, 12b. In this state, the crotch portion 8 of the outer casing 1 and the crotch portion 18 of the end stud 4 are in contact with the end faces of the adapter rings 12a and 12b, respectively. The ring portions 11a and 11b are annular recessed portions 8b located at the crotch portion 8 and annular recessed portions 18b of the crotch portion 18. The annular projection 8a of the crotch portion 8 and the annular projection 18a of the crotch portion 18 are the first annular recessed portions 14a1 and 14b1 which are located at the respective ring portions 11a and 11b. Further, the ring portions 11a and 11b are press-fitted into the annular recessed portions 8b and 18b of the respective jaw portions 8, 18 to be elastically deformed, and a part thereof is displaced in the axial direction of the stator body 10. Accordingly, as shown in Figs. 4 and 7, the outer cylinder 9 is separated from the adapter rings 12a and 12b.

Next, the first cooker 15 and the second cooker 16 are attached to the adapter rings 12a and 12b and the respective jaw portions 8 and 18 to strongly fix the sub-body 10 And the connection of the end stud 4 and the outer casing 1. Further, the nut 22 is screwed to the support bolt 19, and the outer tube 9 is held between the outer casing 1 and the end stud 4 through the support piece 20. Thereby, as shown in FIGS. 5 and 8, the stator body 10 is compressed in the axial direction. Further, the end surface of the ring portion 11a is an inner end surface of the annular recess 18b which is crimped to the end studs 4. Further, the end surface of the ring portion 11b is an inner end surface of the annular recessed portion 8b which is crimped to the flange portion 8 formed on the outer casing 1. Thereby, it is possible to ensure the desired airtightness at the connection portion, and it is possible to prevent liquid leakage and intrusion of bacteria generated by exposure to the surrounding atmosphere during any of the normal operation and the cleaning operation. .

The stator main body 10 is a rubber selected for a material to be appropriately transferred, and is formed into a cylindrical shape (for example, a cylindrical shape) of an elastic material such as a resin (for example, a fluororubber in a cosmetic containing ruthenium rubber or eucalyptus oil). The central hole of the stator 2 has an inner circumferential surface which is formed in a single segment of n or a plurality of segments in the shape of a female thread. Ring portions 11a and 11b having a large outer diameter are formed in both end portions of the stator body 10, and the adapter rings 12a and 12b are attached to each other by the ring portions 11a and 11b.

The adapter rings 12a and 12b are made of a metal material such as stainless steel. As shown in Fig. 1, the tubular portions 13a and 13b and the ridges projecting from the one end of the tubular portions 13a and 13b toward the outer diameter side are provided. The parts 14a and 14b are comprised. In the crotch portions 14a and 14b, first annular recessed portions 14a1 and 14b1 and second annular recessed portions 14a2 and 14b2 having smaller inner diameters are formed in order from the end faces thereof. Since the adapter bodies 12a and 12b of the stator main body 10 are provided by the elastic material, the ring portions 11a and 11b are elastically deformed toward the inner diameter side.

The adapter ring 12a is held by the first cooker 15 in a state in which the crotch portion 14a is brought into contact with the crotch portion 18 of the end stud 4 to be described later. As shown in Fig. 9, the first cooker 15 is composed of a pair of semicircular cooker portions 15b and 15c that are rotatably coupled to the support shaft portion 15a, and includes two cookware portions 15b and 15c. The clip portion 15d that is fixed in an annular state. The two cookware portions 15b and 15c are formed by an annular groove (not shown) formed on the inner circumferential surface in an annular state, and the crotch portion 14a of the adapter ring 12a and the crotch portion 18 of the end stud 4 are formed. maintain. Further, the adapter ring 12b is held by the second cooker 16 having the same configuration as the first cooker 15 in a state in which the crotch portion 14b is in contact with the crotch portion 8 of the outer casing 1.

Both the first cooker 15 and the second cooker 16 are made of the same metal material (here, stainless steel) as the adapter rings 12a and 12b. That is, the adapter rings 12a and 12b made of a homogenous hard material, the first cooker 15 and the second cooker 16 can be directly in contact with each other. Therefore, when the stator body made of a resin, a rubber material or the like and the first cooker 15 or the second cooker 16 made of a metal material are in direct contact with each other, the portion which is not deformed can stabilize the holding state. Thereby, the positional deviation in the connecting portion is prevented, the flange portions 14a, 14b of the adapter rings 12a, 12b composed of a hard metal material, the crotch portion 8 of the outer casing 1, and the crotch portion 18 for the end stud 4 The crimped state of the stator body 10 made of a soft rubber or a resin material can be in a desired state. As a result, the airtightness in each of the connection portions is maintained, and in any of the normal operation and the cleaning operation, it is possible to prevent liquid leakage and intrusion of bacteria generated by the surrounding atmosphere.

Further, in the ring portions 11a and 11b formed at both end portions of the stator main body 10, as shown in Fig. 10, the metal ring 39 may be housed (but in Fig. 10, only the illustrated ring is shown). Side 11a). Thereby, the holding state by the cookers 15 and 16 can be made stronger, and the airtightness of the connecting portion can be further improved. It is not only the combination of the metal ring 39 and the adapter rings 12a and 12b but the use of the adapter ring 12a or 12b in the ring 39, and at least one of the adapter rings 12a or 12b is omitted. The composition can also be.

As shown in Fig. 1, the rotor 3 is formed of a single-stage or a plurality of male-threaded shapes of n-1 shafts made of a metal material. The rotor 3 is disposed in a center hole of the stator 2, and is formed in a transfer space 17 that is connected in the longitudinal direction thereof. One end portion of the rotor 3 is coupled to the coupling rod 5 on the outer casing side, and is rotated on the inner side of the stator 2 by the driving force from a driving machine (not shown) and revolves along the inner circumferential surface of the stator 2. That is, the rotor 3 is eccentrically rotated in the center hole of the stator 2, and the material in the transfer space 17 can be transferred in the longitudinal direction.

The end studs 4 are formed by forming a metal material into a tubular shape. A crotch portion 18 that is enlarged outward is formed at one end opening of the end stud 4 . The crotch portion 18 is held by the first cooker 15 in a state of being in contact with the crotch portion 14a of the adapter ring 12a as described above.

The end studs 4 and the outer casing 1 are coupled to each other by a support bolt 19. That is, in the outer peripheral surfaces of the end studs 4 and the outer casing 1, the support sheets 20 are formed separately at the point symmetrical position 2 centering on the axial center. The support bolt 19 is made of a metal material such as stainless steel. In the state in which the tubular spacer 21 is externally attached, the end studs 4 and the support pieces 20 of the outer casing 1 are screwed to the one end nut 22. In this case, when the nut 22 is tightened in a state where the outer cylinder 9 is removed from the stator main body 10, the spacer 21 abuts against the end stud 4 and the support piece 20 of the outer casing 1. Therefore, the nut 22 cannot be tightened more, and the interval between the end studs 4 and the outer casing 1 is maintained at a constant value. On the other hand, when the nut 22 is screwed in the state in which the outer cylinder 9 is attached to the stator body 10, the outer cylinder 9 is separately attached to the stator body 10 before the spacer 21 abuts against the support piece 20. The tubular portions 13a and 13b of the adapter rings 12a and 12b at both ends abut. Therefore, the nut 22 cannot be tightened, and the interval between the end studs 4 and the outer casing 1 is maintained at a constant value wider than the interval maintained by the spacer 21 (about 1 mm).

Next, the operation of the uniaxial eccentric screw pump constituted by the above configuration will be described.

When the fluid is discharged from a tub or the like, the driver (not shown) is driven to rotate the rotor 3 through the coupler 6 and the coupler lever 5. Thereby, the transfer space 17 formed by the inner peripheral surface of the stator 2 and the outer peripheral surface of the rotor 3 is moved in the longitudinal direction. Thereby, the fluid discharged from the tub is sucked toward the transfer space 17, and is transferred toward the end stud 4. Moreover, the flow reaching the end studs 4 is further transferred to other places.

However, in the above-described uniaxial eccentric screw pump, when the transfer of the fluid is stopped, the fluid remains in the stator 2, and if it is placed, it is not sanitary. Moreover, this residue is also attached to the inner surface. Therefore, it is necessary to clean and sterilize the inside of the stator 2. Here, proceed: no It is necessary to disassemble the production equipment, and it can be safely and automatically cleaned by a simple operation (CIP: Cleaning in Place); and the sterilization can be sterilized without disassembling the machine and piping from the state at the time of manufacture ( SIP: sterilizing in place). Therefore, there is no need to worry about the intrusion of bacteria and the like in the surrounding atmosphere.

For example, in the case of SIP, the outer cylinder 9 is removed from the outer circumference of the stator 2. Further, water vapor or pressurized hot water (heating fluid) is supplied, and the driver is driven to rotate the rotor 3. At this time, the stator 2 is expanded by heat, but since the outer cylinder 9 is removed, it can be expanded toward the outer diameter side, and the expansion toward the inner surface side can be suppressed. Therefore, the rotation of the rotor 3 is not impaired, and the transfer space 17 is moved by the rotation of the rotor 3 to smoothly flow the heating fluid to clean and sterilize the inner surface of the stator 2.

Thereafter, the SIP is terminated, and the uniaxial eccentric screw pump is cooled by the passage of time, and when the stator body 10 is returned to the original shape, the outer cylinder 9 is installed at the outer peripheral portion thereof, and the original fluid can be transferred again. .

Thus, according to the uniaxial eccentric screw pump of the foregoing embodiment, the outer cylinder 9 is removed when the heating fluid is supplied. Therefore, expansion by the heating fluid toward the outer diameter side of the stator body 10 can be tolerated. Therefore, the expansion of the stator main body 10 toward the inner diameter side does not impair the rotation of the rotor 3, and the heating fluid can be supplied to clean and sterilize the inside of the stator 2. Further, since both end portions of the stator main body 10 are constantly maintained in a state of being connected to the end studs 4 and the outer casing 1 in an airtight state, bacteria or the like in the surrounding atmosphere does not intrude into the internal space, and sterilization can be maintained. After a clean environment.

At the time of washing and sterilization, since it is possible to thermally expand toward the outer diameter side of the stator body 10, it is not necessary to increase the interval between the inner surface of the stator and the outer surface of the rotor by considering thermal expansion toward the inner diameter side. Therefore, in the normal operation state in which the thermal expansion is not performed, the contact pressure of the inner surface of the stator main body 10 and the outer surface of the rotor 3, and the interference amount (the inner surface of the stator main body 10 and the outer surface of the rotor 3) can be made appropriate. value. Therefore, the discharge pressure is a predetermined value, and the transfer of the fluid during the normal operation can be efficiently performed.

Further, the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

For example, in the above-described embodiment, the uniaxial eccentric screw pump is disposed in the lateral direction (horizontal direction), but the fluid may be transferred to the lower side by the vertical direction (vertical direction).

Further, in the above-described embodiment, the uniaxial eccentric screw pump, particularly the support structure of the stator 2, is not particularly described, but may be configured as follows.

That is, in Fig. 11, the end studs 4 and the outer casing 1 are supported by the first support frame 23 fixed to the base. The first support frame 23 is composed of a bottom surface portion 23a and both side surface portions 23b and 23c, and the center of the bottom surface portion is screwed to the base, and the bolt is screwed to the end screw pile 4 and the outer casing 1 through the both side surfaces. . The stator 2 is supported by a second support frame 24 that is fixed to the base. The second support frame 24 is composed of both side surface portions 24a and 24b and an upper surface portion 24c that connects the upper end portions thereof. The lower end portions of the side surface portions 24a, 24b are screwed to the base in a zigzag direction in the horizontal direction. And the convex portion 25 abutting on the outer tube 9 in the inner side surface of one side surface portion is integrated Chemical. In the other side surface portion, the screw 26 is screwed from the outside, and the tip end portion thereof abuts against the outer tube 9. By changing the screwing position of the screw 26, the pressing force of the leading end portion toward the outer cylinder 9 can be adjusted.

Further, as shown in Fig. 12, the upper cover 27 and the lower cover 28 constituting the outer cylinder 9 may be held by the holding member 29. The holding member 29 is provided with an upper pallet 30 and a lower pallet 31 which are held in a state in which the extending portions 27b and 28b of the upper cover 27 and the lower cover 28 are vertically overlapped. The mounting plate 33 is attached to the lower pallet 31 via the connecting rod 32. The mounting bracket 33 is screwed to the base. The upper pallet 30 and the lower pallet 31 of the gripping member 29 are inserted into the upper cover 27 and the extending portions 27b and 28b of the lower cover 28, and the bolts 38a are inserted to screw the nuts 38b. . By screwing the nut 38b, the upper cover 27 and the lower cover 28 of the outer cylinder 9 can be strongly fixed.

Further, as shown in Fig. 13, the lower surface of the extending portion 28b of the lower cover 28 is supported by the support base 34, and the pressing portion 35 may be pressed against the upper surface of the extending portion 27b of the upper cover 27. The pressing portion 35 is movable up and down by the hydraulic cylinder 36. Thereby, when the inside of the stator main body 10 is washed and sterilized by the heating fluid, the pressing portion 35 is raised by driving the hydraulic cylinder 36, and the holding state of the stator main body 10 by the upper cover 27 is released. Thereby, even if the heating fluid is supplied into the stator body 10, the stator body 10 can be deformed toward the outer diameter side by thermal expansion. Therefore, the inner surface of the stator body 10 does not expand toward the inner side and hinders the rotation of the rotor 3. As a result, in the stator body 10, the rotor 3 can be rotated to transfer the heating fluid. Moreover, in the raising and lowering of the pressing portion 35, it is not limited to the hydraulic cylinder 36, and a pneumatic cylinder can be used. Various driving methods such as electromagnetic coils and motors. Further, the upper cover 27 may have a through hole formed in the extending portion 27b to allow the guide shaft to be inserted, and the movement range when the pressing portion 35 is raised may be restricted.

As shown in Fig. 14, in place of the pressing portion 35, the driving guide member 37 can be displaced downward by the hydraulic cylinder (not shown), and the upper cover 27 can be pressed toward the lower cover 28. can.

Although not shown, the interval between the upper cover 27 and the lower cover 28 may be adjusted. That is, a threaded hole is formed in each of the extending portion 27b of the upper cover 27 and the extending portion 28b of the lower cover 28. Further, two bolts having different thread cutting directions are screwed to the respective screw holes at both end sides. Thus, when the two bolts are rotated, the upper cover 27 and the lower cover 28 can be engaged.

In this case, the two bolts may be rotated by a driving means such as a motor (not shown). Further, when the cleaning and sterilization treatment of the uniaxial eccentric screw pump is started, it is preferable to automatically drive the driving means to rotate the two bolts to widen the interval between the upper cover 27 and the lower cover 28. This operation may be performed automatically, for example, by a temperature sensor that detects the temperature of the stator body 10 and a detection signal that detects the degree of expansion of the stator body 10, a pressure sensor, or the like. For example, the detection signal in the detection device is taken in to the control device, and the interval between the upper cover 27 and the lower cover 28 may be changed depending on whether the detected value exceeds a predetermined value or the like. Thereby, the interval between the upper cover 27 and the lower cover 28 can be automatically adjusted so that the rotor 3 does not rotate by the expansion of the stator body 10 during washing and sterilization without passing through the human hand.

Moreover, the spacing between the upper cover 27 and the lower cover 28 is self-determined. Although the dynamic adjustment is performed by two bolts, for example, it may be carried out by the bolt 38a and the nut 38b as shown in Figs. 2 and 12 . Further, the configurations shown in Figs. 13 and 14 may have the same automatic adjustment function.

In addition, the outer cylinder 9 is not limited to the two divisions of the upper cover 27 and the lower cover 28, and is formed by a plurality of covers divided in the circumferential direction, and the number of divisions is not particularly limited. For example, in Fig. 15(a), the outer cylinder 9 is divided into three in the circumferential direction, and the four-division is shown in Fig. 15(b).

1‧‧‧Shell

2‧‧‧stator

3‧‧‧Rotor

4‧‧‧End studs

5‧‧‧Connector rod

6‧‧‧Connector

7‧‧‧Connecting tube

8‧‧‧锷

9‧‧‧Outer tube

11a, 11b‧‧‧ ring

12a, 12b‧‧‧ adapter ring

13a, 13b‧‧‧ tubular

14a, 14b‧‧‧锷

15‧‧‧1st cookware

16‧‧‧2nd cookware

17‧‧‧Transfer space

18‧‧‧锷

19‧‧‧Support bolts

20‧‧‧Support film

21‧‧‧ spacer

22‧‧‧ Nuts

Claims (7)

A uniaxial eccentric screw pump comprising: a casing; and a stator having an end portion connected to the casing and having an inner circumferential surface forming a female screw type; and a shaft body insertable through the stator and having a male screw type The rotor and the end stud that is connected to the other end of the stator, the stator is composed of a stator body and an outer cylinder that is detachably disposed on an outer peripheral portion thereof, and the stator body and the outer casing are The connecting portion and the connecting portion between the stator body and the end stud are provided with at least a locking structure for preventing entry of foreign matter from the outside. The uniaxial eccentric screw pump according to the first aspect of the invention, wherein the blocking structure is a sealing structure that prevents leakage from the both end portions of the stator toward the outside. A uniaxial eccentric screw pump according to claim 1, wherein the stator body is made of rubber or a resin material, and the outer cylinder is made of a metal material. The uniaxial eccentric screw pump according to the first aspect of the invention, wherein the locking structure includes: the end stud pile and the aforementioned a crotch portion of the connecting portion of the stator, a first cooker held in a state in which the two crotch portions are in contact with each other, a crotch portion formed at a connecting portion of the outer casing and the stator, and the two crotch portions are held in each other The second cookware of the state of the abutment. The uniaxial eccentric screw pump according to the first aspect of the invention, further comprising: a support bolt that connects the outer casing and the end screw pile, and a sheath bolt that is externally attached to the support bolt and the outer casing and the end portion The pile abuts the spacer that maintains the two at regular intervals. The uniaxial eccentric screw pump according to claim 1, wherein the outer cylinder is composed of a plurality of covers that are divided in the circumferential direction, and includes an adjustment means for adjusting an interval between the covers. The uniaxial eccentric screw pump according to claim 6 is characterized in that: the detection means for detecting the degree of expansion toward the outer diameter side of the stator body, and the adjustment by the detection value in the detection means The means drive control means for automatically adjusting the interval of the aforementioned cover.